Hello Jonathan,
Cunard White Star, as I knew the company, had generally good sea ships in my opinion, built by Harland and Wolff and on Clydeside, perhaps the finest shipyards of their day.
One of the big ''work ups''for the helmsman is a heavy sea on the quarter which does indeed cause the vessel to corkscrew.
The ''Ascania'' was one of the best sea ships I had sailed on across the pond, taking beam on seas as though she had stabilizers. The ''Mary'' was a bit of a ''roller'', and the '' Saxonia'' a bit of a ''pounder''although the ''Lizzie'' took most of what the North Atlantic threw at her in her stride.
All ships in my experience behave differently and a typical example of this was with the identical Fyffes banana ships, ''Camito'' and ''Golfito.''
The ''Golfito'', with a passenger carrying capacity of around 120 persons, was the flagship of the fleet and steered a good course with about 3 to 4 spokes of starboard helm in good conditions.
AB's ,Quartermasters, Helmsman or whatever, find it makes life easy if they know the charcteristics of how much wheel a ship carries.
The ''Camito'' steered like a pig in all conditions and the ship could roll on wet grass!
When the ''Andes'' was fitted with stabilizers she lurched quite a bit leaving many falling on their arses in heavy weather! So much for progress in those days!
I hope this has enlightened you slightly on the way some of the ''ladies of the seas'' have been known to behave from time to time.
All the best,
David H